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Re-write recursion handling to fix another compiler bug and make it all less 

error-prone.
This commit is contained in:
Philip.Hazel 2015-08-09 16:29:35 +00:00
parent c214c54ca0
commit e3d62b0ff8
16 changed files with 912 additions and 471 deletions
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8
ChangeLog
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@ -111,6 +111,14 @@ binary file, it incorrectly wrote output to stdout.
29. The JIT compiler did not restore the control verb head in case of *THEN 29. The JIT compiler did not restore the control verb head in case of *THEN
control verbs. This issue was found by Karl Skomski with a custom LLVM fuzzer. control verbs. This issue was found by Karl Skomski with a custom LLVM fuzzer.
30. The way recursive references such as (?3) are compiled has been re-written
because the old way was the cause of many issues. Now, conversion of the group
number into a pattern offset does not happen until the pattern has been
completely compiled. This does mean that detection of all infinitely looping
recursions is postponed till match time. In the past, some easy ones were
detected at compile time. This re-writing was done in response to yet another
bug found by the LLVM fuzzer.
Version 10.20 30-June-2015 Version 10.20 30-June-2015
-------------------------- --------------------------

515
src/pcre2_compile.c
View File

@ -101,21 +101,9 @@ pre-compile phase when determining how much memory is required. The regex is
partly compiled into this space, but the compiled parts are discarded as soon partly compiled into this space, but the compiled parts are discarded as soon
as they can be, so that hopefully there will never be an overrun. The code as they can be, so that hopefully there will never be an overrun. The code
does, however, check for an overrun. The largest amount I've seen used is 218, does, however, check for an overrun. The largest amount I've seen used is 218,
so this number is very generous. so this number is very generous. */
The same workspace is used during the second, actual compile phase for
remembering forward references to groups so that they can be filled in at the
end. Each entry in this list occupies LINK_SIZE bytes, so even when LINK_SIZE
is 4 there is plenty of room for most patterns. However, the memory can get
filled up by repetitions of forward references, for example patterns like
/(?1){0,1999}(b)/, and one user did hit the limit. The code has been changed so
that the workspace is expanded in this situation. The value below is therefore
a minimum, and we put a maximum on it for safety. The minimum is now also
defined in terms of LINK_SIZE so that the size increase kicks in at the same
number of forward references in all cases. */
#define COMPILE_WORK_SIZE (2048*LINK_SIZE) #define COMPILE_WORK_SIZE (2048*LINK_SIZE)
#define COMPILE_WORK_SIZE_MAX (100*COMPILE_WORK_SIZE)
/* The overrun tests check for a slightly smaller size so that they detect the /* The overrun tests check for a slightly smaller size so that they detect the
overrun before it actually does run off the end of the data block. */ overrun before it actually does run off the end of the data block. */
@ -1215,18 +1203,23 @@ for (;;)
*************************************************/ *************************************************/
/* This function scans through a branch of a compiled pattern to see whether it /* This function scans through a branch of a compiled pattern to see whether it
can match the empty string. It is called from could_be_empty() below and from can match the empty string. It is called at the end of compiling to check the
compile_branch() when checking for an unlimited repeat of a group that can entire pattern, and from compile_branch() when checking for an unlimited repeat
match nothing. Note that first_significant_code() skips over backward and of a group that can match nothing. In the latter case it is called only when
negative forward assertions when its final argument is TRUE. If we hit an doing the real compile, not during the pre-compile that measures the size of
unclosed bracket, we return "empty" - this means we've struck an inner bracket the compiled pattern.
whose current branch will already have been scanned.
Note that first_significant_code() skips over backward and negative forward
assertions when its final argument is TRUE. If we hit an unclosed bracket, we
return "empty" - this means we've struck an inner bracket whose current branch
will already have been scanned.
Arguments: Arguments:
code points to start of search code points to start of search
endcode points to where to stop endcode points to where to stop
utf TRUE if in UTF mode utf TRUE if in UTF mode
cb compile data cb compile data
atend TRUE if being called to check an entire pattern
recurses chain of recurse_check to catch mutual recursion recurses chain of recurse_check to catch mutual recursion
Returns: TRUE if what is matched could be empty Returns: TRUE if what is matched could be empty
@ -1234,7 +1227,7 @@ Returns: TRUE if what is matched could be empty
static BOOL static BOOL
could_be_empty_branch(PCRE2_SPTR code, PCRE2_SPTR endcode, BOOL utf, could_be_empty_branch(PCRE2_SPTR code, PCRE2_SPTR endcode, BOOL utf,
compile_block *cb, recurse_check *recurses) compile_block *cb, BOOL atend, recurse_check *recurses)
{ {
register PCRE2_UCHAR c; register PCRE2_UCHAR c;
recurse_check this_recurse; recurse_check this_recurse;
@ -1257,35 +1250,27 @@ for (code = first_significant_code(code + PRIV(OP_lengths)[*code], TRUE);
continue; continue;
} }
/* For a recursion/subroutine call, if its end has been reached, which /* For a recursion/subroutine call we can scan the recursion when this
implies a backward reference subroutine call, we can scan it. If it's a function is called at the end, to check a complete pattern. Before then,
forward reference subroutine call, we can't. To detect forward reference recursions just have the group number as their argument and in any case may
we have to scan up the list that is kept in the workspace. This function is be forward references. In that situation, we return TRUE, just in case. It
called only when doing the real compile, not during the pre-compile that means that unlimited repeats of groups that contain recursions are always
measures the size of the compiled pattern. */ treated as "could be empty" - which just adds a bit more processing time
because of the runtime check. */
if (c == OP_RECURSE) if (c == OP_RECURSE)
{ {
PCRE2_SPTR scode = cb->start_code + GET(code, 1); PCRE2_SPTR scode, endgroup;
PCRE2_SPTR endgroup = scode;
BOOL empty_branch; BOOL empty_branch;
/* Test for forward reference or uncompleted reference. This is disabled if (!atend) return TRUE;
when called to scan a completed pattern by setting cb->start_workspace to scode = cb->start_code + GET(code, 1);
NULL. */ endgroup = scode;
if (cb->start_workspace != NULL) /* We need to detect whether this is a recursive call, as otherwise there
{ will be an infinite loop. If it is a recursion, just skip over it. Simple
PCRE2_SPTR tcode; recursions are easily detected. For mutual recursions we keep a chain on
for (tcode = cb->start_workspace; tcode < cb->hwm; tcode += LINK_SIZE) the stack. */
if ((int)GET(tcode, 0) == (int)(code + 1 - cb->start_code)) return TRUE;
if (GET(scode, 1) == 0) return TRUE; /* Unclosed */
}
/* If the reference is to a completed group, we need to detect whether this
is a recursive call, as otherwise there will be an infinite loop. If it is
a recursion, just skip over it. Simple recursions are easily detected. For
mutual recursions we keep a chain on the stack. */
do endgroup += GET(endgroup, 1); while (*endgroup == OP_ALT); do endgroup += GET(endgroup, 1); while (*endgroup == OP_ALT);
if (code >= scode && code <= endgroup) continue; /* Simple recursion */ if (code >= scode && code <= endgroup) continue; /* Simple recursion */
@ -1297,8 +1282,8 @@ for (code = first_significant_code(code + PRIV(OP_lengths)[*code], TRUE);
if (r != NULL) continue; /* Mutual recursion */ if (r != NULL) continue; /* Mutual recursion */
} }
/* Completed reference; scan the referenced group, remembering it on the /* Scan the referenced group, remembering it on the stack chain to detect
stack chain to detect mutual recursions. */ mutual recursions. */
empty_branch = FALSE; empty_branch = FALSE;
this_recurse.prev = recurses; this_recurse.prev = recurses;
@ -1306,7 +1291,7 @@ for (code = first_significant_code(code + PRIV(OP_lengths)[*code], TRUE);
do do
{ {
if (could_be_empty_branch(scode, endcode, utf, cb, &this_recurse)) if (could_be_empty_branch(scode, endcode, utf, cb, atend, &this_recurse))
{ {
empty_branch = TRUE; empty_branch = TRUE;
break; break;
@ -1363,7 +1348,7 @@ for (code = first_significant_code(code + PRIV(OP_lengths)[*code], TRUE);
do do
{ {
if (!empty_branch && could_be_empty_branch(code, endcode, utf, cb, if (!empty_branch && could_be_empty_branch(code, endcode, utf, cb,
recurses)) empty_branch = TRUE; atend, recurses)) empty_branch = TRUE;
code += GET(code, 1); code += GET(code, 1);
} }
while (*code == OP_ALT); while (*code == OP_ALT);
@ -1584,77 +1569,6 @@ return TRUE;
/*************************************************
* Scan compiled regex for non-emptiness *
*************************************************/
/* This function is called to check for left recursive calls. We want to check
the current branch of the current pattern to see if it could match the empty
string. If it could, we must look outwards for branches at other levels,
stopping when we pass beyond the bracket which is the subject of the recursion.
This function is called only during the real compile, not during the
pre-compile.
Arguments:
code points to start of the recursion
endcode points to where to stop (current RECURSE item)
bcptr points to the chain of current (unclosed) branch starts
utf TRUE if in UTF mode
cb compile data
Returns: TRUE if what is matched could be empty
*/
static BOOL
could_be_empty(PCRE2_SPTR code, PCRE2_SPTR endcode, branch_chain *bcptr,
BOOL utf, compile_block *cb)
{
while (bcptr != NULL && bcptr->current_branch >= code)
{
if (!could_be_empty_branch(bcptr->current_branch, endcode, utf, cb, NULL))
return FALSE;
bcptr = bcptr->outer;
}
return TRUE;
}
/*************************************************
* Expand the workspace *
*************************************************/
/* This function is called during the second compiling phase, if the number of
forward references fills the existing workspace, which is originally a block on
the stack. A larger block is obtained from the heap unless the ultimate limit
has been reached or the increase will be rather small.
Argument: pointer to the compile data block
Returns: 0 if all went well, else an error number
*/
static int
expand_workspace(compile_block *cb)
{
PCRE2_UCHAR *newspace;
int newsize = cb->workspace_size * 2;
if (newsize > COMPILE_WORK_SIZE_MAX) newsize = COMPILE_WORK_SIZE_MAX;
if (cb->workspace_size >= COMPILE_WORK_SIZE_MAX ||
newsize - cb->workspace_size < WORK_SIZE_SAFETY_MARGIN)
return ERR72;
newspace = cb->cx->memctl.malloc(CU2BYTES(newsize), cb->cx->memctl.memory_data);
if (newspace == NULL) return ERR21;
memcpy(newspace, cb->start_workspace, cb->workspace_size * sizeof(PCRE2_UCHAR));
cb->hwm = (PCRE2_UCHAR *)newspace + (cb->hwm - cb->start_workspace);
if (cb->workspace_size > COMPILE_WORK_SIZE)
cb->cx->memctl.free((void *)cb->start_workspace, cb->cx->memctl.memory_data);
cb->start_workspace = newspace;
cb->workspace_size = newsize;
return 0;
}
/************************************************* /*************************************************
* Check for counted repeat * * Check for counted repeat *
*************************************************/ *************************************************/
@ -2480,82 +2394,6 @@ for (;;)
/*************************************************
* Adjust OP_RECURSE items in repeated group *
*************************************************/
/* OP_RECURSE items contain an offset from the start of the regex to the group
that is referenced. This means that groups can be replicated for fixed
repetition simply by copying (because the recursion is allowed to refer to
earlier groups that are outside the current group). However, when a group is
optional (i.e. the minimum quantifier is zero), OP_BRAZERO or OP_SKIPZERO is
inserted before it, after it has been compiled. This means that any OP_RECURSE
items within it that refer to the group itself or any contained groups have to
have their offsets adjusted. That is one of the jobs of this function. Before
it is called, the partially compiled regex must be temporarily terminated with
OP_END.
This function has been extended to cope with forward references for recursions
and subroutine calls. It must check the list of such references for the
group we are dealing with. If it finds that one of the recursions in the
current group is on this list, it does not adjust the value in the reference
(which is a group number). After the group has been scanned, all the offsets in
the forward reference list for the group are adjusted.
Arguments:
group points to the start of the group
adjust the amount by which the group is to be moved
utf TRUE in UTF mode
cb compile data
save_hwm_offset the hwm forward reference offset at the start of the group
Returns: nothing
*/
static void
adjust_recurse(PCRE2_UCHAR *group, int adjust, BOOL utf, compile_block *cb,
size_t save_hwm_offset)
{
uint32_t offset;
PCRE2_UCHAR *hc;
PCRE2_UCHAR *ptr = group;
/* Scan the group for recursions. For each one found, check the forward
reference list. */
while ((ptr = (PCRE2_UCHAR *)find_recurse(ptr, utf)) != NULL)
{
for (hc = (PCRE2_UCHAR *)cb->start_workspace + save_hwm_offset; hc < cb->hwm;
hc += LINK_SIZE)
{
offset = (int)GET(hc, 0);
if (cb->start_code + offset == ptr + 1) break;
}
/* If we have not found this recursion on the forward reference list, adjust
the recursion's offset if it's after the start of this group. */
if (hc >= cb->hwm)
{
offset = (int)GET(ptr, 1);
if (cb->start_code + offset >= group) PUT(ptr, 1, offset + adjust);
}
ptr += 1 + LINK_SIZE;
}
/* Now adjust all forward reference offsets for the group. */
for (hc = (PCRE2_UCHAR *)cb->start_workspace + save_hwm_offset; hc < cb->hwm;
hc += LINK_SIZE)
{
offset = (int)GET(hc, 0);
PUT(hc, 0, offset + adjust);
}
}
/************************************************* /*************************************************
* Check for POSIX class syntax * * Check for POSIX class syntax *
*************************************************/ *************************************************/
@ -3598,7 +3436,6 @@ int32_t req_caseopt, reqvary, tempreqvary;
int after_manual_callout = 0; int after_manual_callout = 0;
int escape; int escape;
size_t length_prevgroup = 0; size_t length_prevgroup = 0;
size_t item_hwm_offset = 0;
register uint32_t c; register uint32_t c;
register PCRE2_UCHAR *code = *codeptr; register PCRE2_UCHAR *code = *codeptr;
PCRE2_UCHAR *last_code = code; PCRE2_UCHAR *last_code = code;
@ -3755,16 +3592,6 @@ for (;; ptr++)
last_code = code; last_code = code;
} }
/* In the real compile phase, just check the workspace used by the forward
reference list. */
else if (cb->hwm > cb->start_workspace + cb->workspace_size -
WORK_SIZE_SAFETY_MARGIN)
{
*errorcodeptr = ERR52;
goto FAILED;
}
/* If in \Q...\E, check for the end; if not, we have a literal */ /* If in \Q...\E, check for the end; if not, we have a literal */
if (inescq && (c != CHAR_NULL || ptr < cb->end_pattern)) if (inescq && (c != CHAR_NULL || ptr < cb->end_pattern))
@ -3906,7 +3733,6 @@ for (;; ptr++)
zeroreqcu = reqcu; zeroreqcu = reqcu;
zeroreqcuflags = reqcuflags; zeroreqcuflags = reqcuflags;
previous = code; previous = code;
item_hwm_offset = cb->hwm - cb->start_workspace;
*code++ = ((options & PCRE2_DOTALL) != 0)? OP_ALLANY: OP_ANY; *code++ = ((options & PCRE2_DOTALL) != 0)? OP_ALLANY: OP_ANY;
break; break;
@ -3955,7 +3781,6 @@ for (;; ptr++)
/* Handle a real character class. */ /* Handle a real character class. */
previous = code; previous = code;
item_hwm_offset = cb->hwm - cb->start_workspace;
/* PCRE supports POSIX class stuff inside a class. Perl gives an error if /* PCRE supports POSIX class stuff inside a class. Perl gives an error if
they are encountered at the top level, so we'll do that too. */ they are encountered at the top level, so we'll do that too. */
@ -4830,16 +4655,6 @@ for (;; ptr++)
PUT(previous, 3 + 2*LINK_SIZE, 2 + 2*LINK_SIZE); PUT(previous, 3 + 2*LINK_SIZE, 2 + 2*LINK_SIZE);
code += 2 + 2 * LINK_SIZE; code += 2 + 2 * LINK_SIZE;
length_prevgroup = 3 + 3*LINK_SIZE; length_prevgroup = 3 + 3*LINK_SIZE;
/* When actually compiling, we need to check whether this was a forward
reference, and if so, adjust the offset. */
if (lengthptr == NULL && cb->hwm >= cb->start_workspace + LINK_SIZE)
{
int offset = GET(cb->hwm, -LINK_SIZE);
if (offset == previous + 1 - cb->start_code)
PUT(cb->hwm, -LINK_SIZE, offset + 1 + LINK_SIZE);
}
} }
/* Now handle repetition for the different types of item. */ /* Now handle repetition for the different types of item. */
@ -5082,7 +4897,6 @@ for (;; ptr++)
{ {
register int i; register int i;
int len = (int)(code - previous); int len = (int)(code - previous);
size_t base_hwm_offset = item_hwm_offset;
PCRE2_UCHAR *bralink = NULL; PCRE2_UCHAR *bralink = NULL;
PCRE2_UCHAR *brazeroptr = NULL; PCRE2_UCHAR *brazeroptr = NULL;
@ -5130,16 +4944,10 @@ for (;; ptr++)
selectively. selectively.
If the maximum is 1 or unlimited, we just have to stick in the BRAZERO If the maximum is 1 or unlimited, we just have to stick in the BRAZERO
and do no more at this point. However, we do need to adjust any and do no more at this point. */
OP_RECURSE calls inside the group that refer to the group itself or any
internal or forward referenced group, because the offset is from the
start of the whole regex. Temporarily terminate the pattern while doing
this. */
if (repeat_max <= 1) /* Covers 0, 1, and unlimited */ if (repeat_max <= 1) /* Covers 0, 1, and unlimited */
{ {
*code = OP_END;
adjust_recurse(previous, 1, utf, cb, item_hwm_offset);
memmove(previous + 1, previous, CU2BYTES(len)); memmove(previous + 1, previous, CU2BYTES(len));
code++; code++;
if (repeat_max == 0) if (repeat_max == 0)
@ -5156,14 +4964,11 @@ for (;; ptr++)
The first one has to be handled carefully because it's the original The first one has to be handled carefully because it's the original
copy, which has to be moved up. The remainder can be handled by code copy, which has to be moved up. The remainder can be handled by code
that is common with the non-zero minimum case below. We have to that is common with the non-zero minimum case below. We have to
adjust the value or repeat_max, since one less copy is required. Once adjust the value or repeat_max, since one less copy is required. */
again, we may have to adjust any OP_RECURSE calls inside the group. */
else else
{ {
int offset; int offset;
*code = OP_END;
adjust_recurse(previous, 2 + LINK_SIZE, utf, cb, item_hwm_offset);
memmove(previous + 2 + LINK_SIZE, previous, CU2BYTES(len)); memmove(previous + 2 + LINK_SIZE, previous, CU2BYTES(len));
code += 2 + LINK_SIZE; code += 2 + LINK_SIZE;
*previous++ = OP_BRAZERO + repeat_type; *previous++ = OP_BRAZERO + repeat_type;
@ -5211,9 +5016,7 @@ for (;; ptr++)
} }
/* This is compiling for real. If there is a set first byte for /* This is compiling for real. If there is a set first byte for
the group, and we have not yet set a "required byte", set it. Make the group, and we have not yet set a "required byte", set it. */
sure there is enough workspace for copying forward references before
doing the copy. */
else else
{ {
@ -5222,29 +5025,9 @@ for (;; ptr++)
reqcu = firstcu; reqcu = firstcu;
reqcuflags = firstcuflags; reqcuflags = firstcuflags;
} }
for (i = 1; i < repeat_min; i++) for (i = 1; i < repeat_min; i++)
{ {
PCRE2_UCHAR *hc;
size_t this_hwm_offset = cb->hwm - cb->start_workspace;
memcpy(code, previous, CU2BYTES(len)); memcpy(code, previous, CU2BYTES(len));
while (cb->hwm > cb->start_workspace + cb->workspace_size -
WORK_SIZE_SAFETY_MARGIN -
(this_hwm_offset - base_hwm_offset))
{
*errorcodeptr = expand_workspace(cb);
if (*errorcodeptr != 0) goto FAILED;
}
for (hc = (PCRE2_UCHAR *)cb->start_workspace + base_hwm_offset;
hc < (PCRE2_UCHAR *)cb->start_workspace + this_hwm_offset;
hc += LINK_SIZE)
{
PUT(cb->hwm, 0, GET(hc, 0) + len);
cb->hwm += LINK_SIZE;
}
base_hwm_offset = this_hwm_offset;
code += len; code += len;
} }
} }
@ -5288,9 +5071,6 @@ for (;; ptr++)
else for (i = repeat_max - 1; i >= 0; i--) else for (i = repeat_max - 1; i >= 0; i--)
{ {
PCRE2_UCHAR *hc;
size_t this_hwm_offset = cb->hwm - cb->start_workspace;
*code++ = OP_BRAZERO + repeat_type; *code++ = OP_BRAZERO + repeat_type;
/* All but the final copy start a new nesting, maintaining the /* All but the final copy start a new nesting, maintaining the
@ -5306,26 +5086,6 @@ for (;; ptr++)
} }
memcpy(code, previous, CU2BYTES(len)); memcpy(code, previous, CU2BYTES(len));
/* Ensure there is enough workspace for forward references before
copying them. */
while (cb->hwm > cb->start_workspace + cb->workspace_size -
WORK_SIZE_SAFETY_MARGIN -
(this_hwm_offset - base_hwm_offset))
{
*errorcodeptr = expand_workspace(cb);
if (*errorcodeptr != 0) goto FAILED;
}
for (hc = (PCRE2_UCHAR *)cb->start_workspace + base_hwm_offset;
hc < (PCRE2_UCHAR *)cb->start_workspace + this_hwm_offset;
hc += LINK_SIZE)
{
PUT(cb->hwm, 0, GET(hc, 0) + len + ((i != 0)? 2+LINK_SIZE : 1));
cb->hwm += LINK_SIZE;
}
base_hwm_offset = this_hwm_offset;
code += len; code += len;
} }
@ -5391,14 +5151,15 @@ for (;; ptr++)
else else
{ {
/* In the compile phase, check for empty string matching. */ /* In the compile phase, check whether the group could match an empty
string. */
if (lengthptr == NULL) if (lengthptr == NULL)
{ {
PCRE2_UCHAR *scode = bracode; PCRE2_UCHAR *scode = bracode;
do do
{ {
if (could_be_empty_branch(scode, ketcode, utf, cb, NULL)) if (could_be_empty_branch(scode, ketcode, utf, cb, FALSE, NULL))
{ {
*bracode += OP_SBRA - OP_BRA; *bracode += OP_SBRA - OP_BRA;
break; break;
@ -5420,14 +5181,11 @@ for (;; ptr++)
{ {
/* For COND brackets, we wrap the whole thing in a possessively /* For COND brackets, we wrap the whole thing in a possessively
repeated non-capturing bracket, because we have not invented POS repeated non-capturing bracket, because we have not invented POS
versions of the COND opcodes. Because we are moving code along, we versions of the COND opcodes. */
must ensure that any pending recursive references are updated. */
if (*bracode == OP_COND || *bracode == OP_SCOND) if (*bracode == OP_COND || *bracode == OP_SCOND)
{ {
int nlen = (int)(code - bracode); int nlen = (int)(code - bracode);
*code = OP_END;
adjust_recurse(bracode, 1 + LINK_SIZE, utf, cb, item_hwm_offset);
memmove(bracode + 1 + LINK_SIZE, bracode, CU2BYTES(nlen)); memmove(bracode + 1 + LINK_SIZE, bracode, CU2BYTES(nlen));
code += 1 + LINK_SIZE; code += 1 + LINK_SIZE;
nlen += 1 + LINK_SIZE; nlen += 1 + LINK_SIZE;
@ -5556,13 +5314,10 @@ for (;; ptr++)
*tempcode = opcode_possessify[repcode]; *tempcode = opcode_possessify[repcode];
/* For opcode without a special possessified version, wrap the item in /* For opcode without a special possessified version, wrap the item in
ONCE brackets. Because we are moving code along, we must ensure that ONCE brackets. */
any pending recursive references are updated. */
else else
{ {
*code = OP_END;
adjust_recurse(tempcode, 1 + LINK_SIZE, utf, cb, item_hwm_offset);
memmove(tempcode + 1 + LINK_SIZE, tempcode, CU2BYTES(len)); memmove(tempcode + 1 + LINK_SIZE, tempcode, CU2BYTES(len));
code += 1 + LINK_SIZE; code += 1 + LINK_SIZE;
len += 1 + LINK_SIZE; len += 1 + LINK_SIZE;
@ -6479,7 +6234,6 @@ for (;; ptr++)
if (firstcuflags == REQ_UNSET) firstcuflags = REQ_NONE; if (firstcuflags == REQ_UNSET) firstcuflags = REQ_NONE;
previous = code; previous = code;
item_hwm_offset = cb->hwm - cb->start_workspace;
*code++ = ((options & PCRE2_CASELESS) != 0)? OP_DNREFI : OP_DNREF; *code++ = ((options & PCRE2_CASELESS) != 0)? OP_DNREFI : OP_DNREF;
PUT2INC(code, 0, index); PUT2INC(code, 0, index);
PUT2INC(code, 0, count); PUT2INC(code, 0, count);
@ -6502,7 +6256,6 @@ for (;; ptr++)
case CHAR_0: case CHAR_1: case CHAR_2: case CHAR_3: case CHAR_4: case CHAR_0: case CHAR_1: case CHAR_2: case CHAR_3: case CHAR_4:
case CHAR_5: case CHAR_6: case CHAR_7: case CHAR_8: case CHAR_9: case CHAR_5: case CHAR_6: case CHAR_7: case CHAR_8: case CHAR_9:
{ {
PCRE2_SPTR called;
terminator = CHAR_RIGHT_PARENTHESIS; terminator = CHAR_RIGHT_PARENTHESIS;
/* Come here from the \g<...> and \g'...' code (Oniguruma /* Come here from the \g<...> and \g'...' code (Oniguruma
@ -6571,76 +6324,29 @@ for (;; ptr++)
recno += cb->bracount; recno += cb->bracount;
} }
/* Come here from code above that handles a named recursion */
HANDLE_RECURSION:
previous = code;
item_hwm_offset = cb->hwm - cb->start_workspace;
called = cb->start_code;
/* When we are actually compiling, find the bracket that is being
referenced. Temporarily end the regex in case it doesn't exist before
this point. If we end up with a forward reference, first check that
the bracket does occur later so we can give the error (and position)
now. Then remember this forward reference in the workspace so it can
be filled in at the end. */
if (lengthptr == NULL)
{
*code = OP_END;
if (recno != 0)
called = PRIV(find_bracket)(cb->start_code, utf, recno);
/* Forward reference */
if (called == NULL)
{
if ((uint32_t)recno > cb->final_bracount) if ((uint32_t)recno > cb->final_bracount)
{ {
*errorcodeptr = ERR15; *errorcodeptr = ERR15;
goto FAILED; goto FAILED;
} }
/* Fudge the value of "called" so that when it is inserted as an /* Come here from code above that handles a named recursion.
offset below, what it actually inserted is the reference number We insert the number of the called group after OP_RECURSE. At the
of the group. Then remember the forward reference, expanding the end of compiling the pattern is scanned and these numbers are
working space where the list is kept if necessary. */ replaced by offsets within the pattern. It is done like this to avoid
problems with forward references and adjusting offsets when groups
called = cb->start_code + recno; are duplicated and moved (as discovered in previous implementations).
if (cb->hwm >= cb->start_workspace + cb->workspace_size - Note that a recursion does not have a set first character (relevant
WORK_SIZE_SAFETY_MARGIN) if it is repeated, because it will then be wrapped with ONCE
{ brackets). */
*errorcodeptr = expand_workspace(cb);
if (*errorcodeptr != 0) goto FAILED;
}
PUTINC(cb->hwm, 0, (int)(code + 1 - cb->start_code));
}
/* If not a forward reference, and the subpattern is still open,
this is a recursive call. We check to see if this is a left
recursion that could loop for ever, and diagnose that case. We
must not, however, do this check if we are in a conditional
subpattern because the condition might be testing for recursion in
a pattern such as /(?(R)a+|(?R)b)/, which is perfectly valid.
Forever loops are also detected at runtime, so those that occur in
conditional subpatterns will be picked up then. */
else if (GET(called, 1) == 0 && cond_depth <= 0 &&
could_be_empty(called, code, bcptr, utf, cb))
{
*errorcodeptr = ERR40;
goto FAILED;
}
}
/* Insert the recursion/subroutine item. It does not have a set first
character (relevant if it is repeated, because it will then be
wrapped with ONCE brackets). */
HANDLE_RECURSION:
previous = code;
*code = OP_RECURSE; *code = OP_RECURSE;
PUT(code, 1, (int)(called - cb->start_code)); PUT(code, 1, recno);
code += 1 + LINK_SIZE; code += 1 + LINK_SIZE;
groupsetfirstcu = FALSE; groupsetfirstcu = FALSE;
cb->had_recurse = TRUE;
} }
/* Can't determine a first byte now */ /* Can't determine a first byte now */
@ -6780,7 +6486,6 @@ for (;; ptr++)
else else
{ {
previous = code; previous = code;
item_hwm_offset = cb->hwm - cb->start_workspace;
} }
*code = bravalue; *code = bravalue;
@ -7098,7 +6803,6 @@ for (;; ptr++)
HANDLE_REFERENCE: HANDLE_REFERENCE:
if (firstcuflags == REQ_UNSET) firstcuflags = REQ_NONE; if (firstcuflags == REQ_UNSET) firstcuflags = REQ_NONE;
previous = code; previous = code;
item_hwm_offset = cb->hwm - cb->start_workspace;
*code++ = ((options & PCRE2_CASELESS) != 0)? OP_REFI : OP_REF; *code++ = ((options & PCRE2_CASELESS) != 0)? OP_REFI : OP_REF;
PUT2INC(code, 0, recno); PUT2INC(code, 0, recno);
cb->backref_map |= (recno < 32)? (1u << recno) : 1; cb->backref_map |= (recno < 32)? (1u << recno) : 1;
@ -7128,7 +6832,6 @@ for (;; ptr++)
if (!get_ucp(&ptr, &negated, &ptype, &pdata, errorcodeptr, cb)) if (!get_ucp(&ptr, &negated, &ptype, &pdata, errorcodeptr, cb))
goto FAILED; goto FAILED;
previous = code; previous = code;
item_hwm_offset = cb->hwm - cb->start_workspace;
*code++ = ((escape == ESC_p) != negated)? OP_PROP : OP_NOTPROP; *code++ = ((escape == ESC_p) != negated)? OP_PROP : OP_NOTPROP;
*code++ = ptype; *code++ = ptype;
*code++ = pdata; *code++ = pdata;
@ -7177,7 +6880,6 @@ for (;; ptr++)
{ {
previous = (escape > ESC_b && escape < ESC_Z)? code : NULL; previous = (escape > ESC_b && escape < ESC_Z)? code : NULL;
item_hwm_offset = cb->hwm - cb->start_workspace;
*code++ = (!utf && escape == ESC_C)? OP_ALLANY : escape; *code++ = (!utf && escape == ESC_C)? OP_ALLANY : escape;
} }
} }
@ -7212,7 +6914,6 @@ for (;; ptr++)
ONE_CHAR: ONE_CHAR:
previous = code; previous = code;
item_hwm_offset = cb->hwm - cb->start_workspace;
/* For caseless UTF mode, check whether this character has more than one /* For caseless UTF mode, check whether this character has more than one
other case. If so, generate a special OP_PROP item instead of OP_CHARI. */ other case. If so, generate a special OP_PROP item instead of OP_CHARI. */
@ -7354,7 +7055,6 @@ int32_t firstcuflags, reqcuflags;
uint32_t branchfirstcu, branchreqcu; uint32_t branchfirstcu, branchreqcu;
int32_t branchfirstcuflags, branchreqcuflags; int32_t branchfirstcuflags, branchreqcuflags;
size_t length; size_t length;
size_t save_hwm_offset;
unsigned int orig_bracount; unsigned int orig_bracount;
unsigned int max_bracount; unsigned int max_bracount;
branch_chain bc; branch_chain bc;
@ -7376,8 +7076,6 @@ bc.current_branch = code;
firstcu = reqcu = 0; firstcu = reqcu = 0;
firstcuflags = reqcuflags = REQ_UNSET; firstcuflags = reqcuflags = REQ_UNSET;
save_hwm_offset = cb->hwm - cb->start_workspace; /* hwm at start of group */
/* Accumulate the length for use in the pre-compile phase. Start with the /* Accumulate the length for use in the pre-compile phase. Start with the
length of the BRA and KET and any extra code units that are required at the length of the BRA and KET and any extra code units that are required at the
beginning. We accumulate in a local variable to save frequent testing of beginning. We accumulate in a local variable to save frequent testing of
@ -7573,18 +7271,13 @@ for (;;)
code += 1 + LINK_SIZE; code += 1 + LINK_SIZE;
/* If it was a capturing subpattern, check to see if it contained any /* If it was a capturing subpattern, check to see if it contained any
recursive back references. If so, we must wrap it in atomic brackets. recursive back references. If so, we must wrap it in atomic brackets. In
Because we are moving code along, we must ensure that any pending recursive any event, remove the block from the chain. */
or forward subroutine references are updated. In any event, remove the
block from the chain. */
if (capnumber > 0) if (capnumber > 0)
{ {
if (cb->open_caps->flag) if (cb->open_caps->flag)
{ {
*code = OP_END;
adjust_recurse(start_bracket, 1 + LINK_SIZE,
(options & PCRE2_UTF) != 0, cb, save_hwm_offset);
memmove(start_bracket + 1 + LINK_SIZE, start_bracket, memmove(start_bracket + 1 + LINK_SIZE, start_bracket,
CU2BYTES(code - start_bracket)); CU2BYTES(code - start_bracket));
*start_bracket = OP_ONCE; *start_bracket = OP_ONCE;
@ -8176,7 +7869,7 @@ cb.dupnames = FALSE;
cb.end_pattern = pattern + patlen; cb.end_pattern = pattern + patlen;
cb.external_flags = 0; cb.external_flags = 0;
cb.external_options = options; cb.external_options = options;
cb.hwm = cworkspace; cb.had_recurse = FALSE;
cb.iscondassert = FALSE; cb.iscondassert = FALSE;
cb.max_lookbehind = 0; cb.max_lookbehind = 0;
cb.name_entry_size = 0; cb.name_entry_size = 0;
@ -8445,8 +8138,7 @@ codestart = (PCRE2_SPTR)((uint8_t *)re + sizeof(pcre2_real_code)) +
the name/number translation table and of the code are passed around in the the name/number translation table and of the code are passed around in the
compile data block. The start/end pattern and initial options are already set compile data block. The start/end pattern and initial options are already set
from the pre-compile phase, as is the name_entry_size field. Reset the bracket from the pre-compile phase, as is the name_entry_size field. Reset the bracket
count and the names_found field. Also reset the hwm field; this time it's used count and the names_found field. */
for remembering forward references to subpatterns. */
cb.parens_depth = 0; cb.parens_depth = 0;
cb.assert_depth = 0; cb.assert_depth = 0;
@ -8454,7 +8146,6 @@ cb.bracount = 0;
cb.max_lookbehind = 0; cb.max_lookbehind = 0;
cb.name_table = (PCRE2_UCHAR *)((uint8_t *)re + sizeof(pcre2_real_code)); cb.name_table = (PCRE2_UCHAR *)((uint8_t *)re + sizeof(pcre2_real_code));
cb.start_code = codestart; cb.start_code = codestart;
cb.hwm = (PCRE2_UCHAR *)(cb.start_workspace);
cb.iscondassert = FALSE; cb.iscondassert = FALSE;
cb.req_varyopt = 0; cb.req_varyopt = 0;
cb.had_accept = FALSE; cb.had_accept = FALSE;
@ -8512,6 +8203,65 @@ if (usedlength > length) errorcode = ERR23; else
#endif #endif
} }
/* Scan the pattern for recursion/subroutine calls and convert the group
numbers into offsets. Maintain a small cache so that repeated groups containing
recursions are efficiently handled. */
#define RSCAN_CACHE_SIZE 8
if (errorcode == 0 && cb.had_recurse)
{
PCRE2_UCHAR *rcode;
PCRE2_SPTR rgroup;
int ccount = 0;
int start = RSCAN_CACHE_SIZE;
recurse_cache rc[RSCAN_CACHE_SIZE];
for (rcode = (PCRE2_UCHAR *)find_recurse(codestart, utf);
rcode != NULL;
rcode = (PCRE2_UCHAR *)find_recurse(rcode + 1 + LINK_SIZE, utf))
{
int i, p, recno;
recno = (int)GET(rcode, 1);
if (recno == 0) rgroup = codestart; else
{
PCRE2_SPTR search_from = codestart;
rgroup = NULL;
for (i = 0, p = start; i < ccount; i++, p = (p + 1) & 7)
{
if (recno == rc[p].recno)
{
rgroup = rc[p].group;
break;
}
/* Group n+1 must always start to the right of group n, so we can save
search time below when the new group number is greater than any of the
previously found groups. */
if (recno > rc[p].recno) search_from = rc[p].group;
}
if (rgroup == NULL)
{
rgroup = PRIV(find_bracket)(search_from, utf, recno);
if (rgroup == NULL)
{
errorcode = ERR53;
break;
}
if (--start < 0) start = RSCAN_CACHE_SIZE - 1;
rc[start].recno = recno;
rc[start].group = rgroup;
if (ccount < RSCAN_CACHE_SIZE) ccount++;
}
}
PUT(rcode, 1, rgroup - codestart);
}
}
/* In rare debugging situations we sometimes need to look at the compiled code /* In rare debugging situations we sometimes need to look at the compiled code
at this stage. */ at this stage. */
@ -8520,37 +8270,6 @@ pcre2_printint(re, stderr, TRUE);
fprintf(stderr, "Length=%lu Used=%lu\n", length, usedlength); fprintf(stderr, "Length=%lu Used=%lu\n", length, usedlength);
#endif #endif
/* Fill in any forward references that are required. There may be repeated
references; optimize for them, as searching a large regex takes time. The
test of errorcode inside the loop means that nothing is done if it is already
non-zero. */
if (cb.hwm > cb.start_workspace)
{
int prev_recno = -1;
PCRE2_SPTR groupptr = NULL;
while (errorcode == 0 && cb.hwm > cb.start_workspace)
{
int offset, recno;
cb.hwm -= LINK_SIZE;
offset = GET(cb.hwm, 0);
recno = GET(codestart, offset);
if (recno != prev_recno)
{
groupptr = PRIV(find_bracket)(codestart, utf, recno);
prev_recno = recno;
}
if (groupptr == NULL) errorcode = ERR53;
else PUT(((PCRE2_UCHAR *)codestart), offset, (int)(groupptr - codestart));
}
}
/* If the workspace had to be expanded, free the new memory. */
if (cb.workspace_size > COMPILE_WORK_SIZE)
ccontext->memctl.free((void *)cb.start_workspace,
ccontext->memctl.memory_data);
/* After a successful compile, give an error if there's back reference to a /* After a successful compile, give an error if there's back reference to a
non-existent capturing subpattern. Then, unless disabled, check whether any non-existent capturing subpattern. Then, unless disabled, check whether any
single character iterators can be auto-possessified. The function overwrites single character iterators can be auto-possessified. The function overwrites
@ -8716,7 +8435,7 @@ can be provided to applications. */
do do
{ {
if (could_be_empty_branch(codestart, code, utf, &cb, NULL)) if (could_be_empty_branch(codestart, code, utf, &cb, TRUE, NULL))
{ {
re->flags |= PCRE2_MATCH_EMPTY; re->flags |= PCRE2_MATCH_EMPTY;
break; break;

2
src/pcre2_error.c
View File

@ -112,7 +112,7 @@ static const char compile_error_texts[] =
"number after (?C is greater than 255\0" "number after (?C is greater than 255\0"
"closing parenthesis for (?C expected\0" "closing parenthesis for (?C expected\0"
/* 40 */ /* 40 */
"recursion could loop indefinitely\0" "SPARE ERROR\0"
"unrecognized character after (?P\0" "unrecognized character after (?P\0"
"syntax error in subpattern name (missing terminator)\0" "syntax error in subpattern name (missing terminator)\0"
"two named subpatterns have the same name (PCRE2_DUPNAMES not set)\0" "two named subpatterns have the same name (PCRE2_DUPNAMES not set)\0"

9
src/pcre2_intmodedep.h
View File

@ -647,6 +647,13 @@ typedef struct recurse_check {
PCRE2_SPTR group; PCRE2_SPTR group;
} recurse_check; } recurse_check;
/* Structure for building a cache when filling in recursion offsets. */
typedef struct recurse_cache {
PCRE2_SPTR group;
int recno;
} recurse_cache;
/* Structure for maintaining a chain of pointers to the currently incomplete /* Structure for maintaining a chain of pointers to the currently incomplete
branches, for testing for left recursion while compiling. */ branches, for testing for left recursion while compiling. */
@ -678,7 +685,6 @@ typedef struct compile_block {
PCRE2_SPTR start_code; /* The start of the compiled code */ PCRE2_SPTR start_code; /* The start of the compiled code */
PCRE2_SPTR start_pattern; /* The start of the pattern */ PCRE2_SPTR start_pattern; /* The start of the pattern */
PCRE2_SPTR end_pattern; /* The end of the pattern */ PCRE2_SPTR end_pattern; /* The end of the pattern */
PCRE2_UCHAR *hwm; /* High watermark of workspace */
PCRE2_UCHAR *name_table; /* The name/number table */ PCRE2_UCHAR *name_table; /* The name/number table */
size_t workspace_size; /* Size of workspace */ size_t workspace_size; /* Size of workspace */
uint16_t names_found; /* Number of entries so far */ uint16_t names_found; /* Number of entries so far */
@ -701,6 +707,7 @@ typedef struct compile_block {
int req_varyopt; /* "After variable item" flag for reqbyte */ int req_varyopt; /* "After variable item" flag for reqbyte */
BOOL had_accept; /* (*ACCEPT) encountered */ BOOL had_accept; /* (*ACCEPT) encountered */
BOOL had_pruneorskip; /* (*PRUNE) or (*SKIP) encountered */ BOOL had_pruneorskip; /* (*PRUNE) or (*SKIP) encountered */
BOOL had_recurse; /* Had a recursion or subroutine call */
BOOL check_lookbehind; /* Lookbehinds need later checking */ BOOL check_lookbehind; /* Lookbehinds need later checking */
BOOL dupnames; /* Duplicate names exist */ BOOL dupnames; /* Duplicate names exist */
BOOL iscondassert; /* Next assert is a condition */ BOOL iscondassert; /* Next assert is a condition */

43
testdata/testinput14 vendored
View File

@ -109,4 +109,47 @@
/abc(?=abcde)(?=ab)/allusedtext /abc(?=abcde)(?=ab)/allusedtext
abcabcdefg abcabcdefg
# These tests provoke recursion loops, which give a different error message
# when JIT is used.
/(?R)/I
abcd
/(a|(?R))/I
abcd
defg
/(ab|(bc|(de|(?R))))/I
abcd
fghi
/(ab|(bc|(de|(?1))))/I
abcd
fghi
/x(ab|(bc|(de|(?1)x)x)x)/I
xab123
xfghi
/(?!\w)(?R)/
abcd
=abc
/(?=\w)(?R)/
=abc
abcd
/(?<!\w)(?R)/
abcd
/(?<=\w)(?R)/
abcd
/(a+|(?R)b)/
aaa
bbb
/[^\xff]((?1))/BI
abcd
# End of testinput14 # End of testinput14

43
testdata/testinput16 vendored
View File

@ -204,4 +204,47 @@
/(?:|a|){100}x/jit=1 /(?:|a|){100}x/jit=1
# These tests provoke recursion loops, which give a different error message
# when JIT is used.
/(?R)/I
abcd
/(a|(?R))/I
abcd
defg
/(ab|(bc|(de|(?R))))/I
abcd
fghi
/(ab|(bc|(de|(?1))))/I
abcd
fghi
/x(ab|(bc|(de|(?1)x)x)x)/I
xab123
xfghi
/(?!\w)(?R)/
abcd
=abc
/(?=\w)(?R)/
=abc
abcd
/(?<!\w)(?R)/
abcd
/(?<=\w)(?R)/
abcd
/(a+|(?R)b)/
aaa
bbb
/[^\xff]((?1))/BI
abcd
# End of testinput16 # End of testinput16

22
testdata/testinput2 vendored
View File

@ -1094,12 +1094,6 @@
/(?C)a|b/I /(?C)a|b/I
/(?R)/I
/(a|(?R))/I
/(ab|(bc|(de|(?R))))/I
/x(ab|(bc|(de|(?R))))/I /x(ab|(bc|(de|(?R))))/I
xab xab
xbc xbc
@ -1109,10 +1103,6 @@
*** Failers *** Failers
xyab xyab
/(ab|(bc|(de|(?1))))/I
/x(ab|(bc|(de|(?1)x)x)x)/I
/^([^()]|\((?1)*\))*$/I /^([^()]|\((?1)*\))*$/I
abc abc
a(b)c a(b)c
@ -2347,14 +2337,6 @@ a random value. /Ix
/(?P>)/ /(?P>)/
/(?!\w)(?R)/
/(?=\w)(?R)/
/(?<!\w)(?R)/
/(?<=\w)(?R)/
/[[:foo:]]/ /[[:foo:]]/
/[[:1234:]]/ /[[:1234:]]/
@ -2930,6 +2912,8 @@ a random value. /Ix
ab\=startchar ab\=startchar
/(?P<L1>(?P<L2>0|)|(?P>L2)(?P>L1))/ /(?P<L1>(?P<L2>0|)|(?P>L2)(?P>L1))/
abcd
0abc
/abc(*MARK:)pqr/ /abc(*MARK:)pqr/
@ -3306,8 +3290,6 @@ a random value. /Ix
/[:a[:abc]b:]/B /[:a[:abc]b:]/B
/(a+|(?R)b)/
/^(a(*:A)(d|e(*:B))z|aeq)/auto_callout /^(a(*:A)(d|e(*:B))z|aeq)/auto_callout
adz adz
aez aez

2
testdata/testinput5 vendored
View File

@ -1636,8 +1636,6 @@
/(?<=abc)(|def)/g,utf,replace=<$0> /(?<=abc)(|def)/g,utf,replace=<$0>
123abcáyzabcdef789abcሴqr 123abcáyzabcdef789abcሴqr
/[^\xff]((?1))/utf,debug
/[A-`]/iB,utf /[A-`]/iB,utf
abcdefghijklmno abcdefghijklmno

11
testdata/testinput8 vendored
View File

@ -2,7 +2,8 @@
# shown when the link size is 2. This is just a doublecheck test to ensure the # shown when the link size is 2. This is just a doublecheck test to ensure the
# sizes don't go horribly wrong when something is changed. The pattern contents # sizes don't go horribly wrong when something is changed. The pattern contents
# are all themselves checked in other tests. Unicode, including property # are all themselves checked in other tests. Unicode, including property
# support, is required for these tests. # support, is required for these tests. There are separate output files for
# each code unit size.
#pattern fullbincode,memory #pattern fullbincode,memory
@ -156,4 +157,12 @@
))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) )))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))
/parens_nest_limit=1000,-fullbincode /parens_nest_limit=1000,-fullbincode
/(?(1)(?1)){8,}+()/debug
abcd
/(?(1)|a(?1)b){2,}+()/debug
abcde
/((?1)(?2)(?3)(?4)(?5)(?6)(?7)(?8)(?9)(?9)(?8)(?7)(?6)(?5)(?4)(?3)(?2)(?1)(?0)){2,}()()()()()()()()()/debug
# End of testinput8 # End of testinput8

92
testdata/testoutput14 vendored
View File

@ -239,4 +239,96 @@ Failed: error -52: nested recursion at the same subject position
0: abcabcde 0: abcabcde
>>>>> >>>>>
# These tests provoke recursion loops, which give a different error message
# when JIT is used.
/(?R)/I
Capturing subpattern count = 0
May match empty string
Subject length lower bound = 0
abcd
Failed: error -52: nested recursion at the same subject position
/(a|(?R))/I
Capturing subpattern count = 1
May match empty string
Subject length lower bound = 1
abcd
0: a
1: a
defg
Failed: error -52: nested recursion at the same subject position
/(ab|(bc|(de|(?R))))/I
Capturing subpattern count = 3
May match empty string
Subject length lower bound = 2
abcd
0: ab
1: ab
fghi
Failed: error -52: nested recursion at the same subject position
/(ab|(bc|(de|(?1))))/I
Capturing subpattern count = 3
May match empty string
Subject length lower bound = 2
abcd
0: ab
1: ab
fghi
Failed: error -52: nested recursion at the same subject position
/x(ab|(bc|(de|(?1)x)x)x)/I
Capturing subpattern count = 3
First code unit = 'x'
Subject length lower bound = 3
xab123
0: xab
1: ab
xfghi
Failed: error -52: nested recursion at the same subject position
/(?!\w)(?R)/
abcd
Failed: error -52: nested recursion at the same subject position
=abc
Failed: error -52: nested recursion at the same subject position
/(?=\w)(?R)/
=abc
Failed: error -52: nested recursion at the same subject position
abcd
Failed: error -52: nested recursion at the same subject position
/(?<!\w)(?R)/
abcd
Failed: error -52: nested recursion at the same subject position
/(?<=\w)(?R)/
abcd
Failed: error -52: nested recursion at the same subject position
/(a+|(?R)b)/
aaa
0: aaa
1: aaa
bbb
Failed: error -52: nested recursion at the same subject position
/[^\xff]((?1))/BI
------------------------------------------------------------------
Bra
[^\x{ff}]
CBra 1
Recurse
Ket
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 1
Subject length lower bound = 1
abcd
Failed: error -52: nested recursion at the same subject position
# End of testinput14 # End of testinput14

98
testdata/testoutput16 vendored
View File

@ -383,4 +383,102 @@ JIT compilation was successful
/(?:|a|){100}x/jit=1 /(?:|a|){100}x/jit=1
# These tests provoke recursion loops, which give a different error message
# when JIT is used.
/(?R)/I
Capturing subpattern count = 0
May match empty string
Subject length lower bound = 0
JIT compilation was successful
abcd
Failed: error -46: JIT stack limit reached
/(a|(?R))/I
Capturing subpattern count = 1
May match empty string
Subject length lower bound = 1
JIT compilation was successful
abcd
0: a (JIT)
1: a
defg
Failed: error -46: JIT stack limit reached
/(ab|(bc|(de|(?R))))/I
Capturing subpattern count = 3
May match empty string
Subject length lower bound = 2
JIT compilation was successful
abcd
0: ab (JIT)
1: ab
fghi
Failed: error -46: JIT stack limit reached
/(ab|(bc|(de|(?1))))/I
Capturing subpattern count = 3
May match empty string
Subject length lower bound = 2
JIT compilation was successful
abcd
0: ab (JIT)
1: ab
fghi
Failed: error -46: JIT stack limit reached
/x(ab|(bc|(de|(?1)x)x)x)/I
Capturing subpattern count = 3
First code unit = 'x'
Subject length lower bound = 3
JIT compilation was successful
xab123
0: xab (JIT)
1: ab
xfghi
Failed: error -46: JIT stack limit reached
/(?!\w)(?R)/
abcd
Failed: error -46: JIT stack limit reached
=abc
Failed: error -46: JIT stack limit reached
/(?=\w)(?R)/
=abc
Failed: error -46: JIT stack limit reached
abcd
Failed: error -46: JIT stack limit reached
/(?<!\w)(?R)/
abcd
Failed: error -46: JIT stack limit reached
/(?<=\w)(?R)/
abcd
Failed: error -46: JIT stack limit reached
/(a+|(?R)b)/
aaa
0: aaa (JIT)
1: aaa
bbb
Failed: error -46: JIT stack limit reached
/[^\xff]((?1))/BI
------------------------------------------------------------------
Bra
[^\x{ff}]
CBra 1
Recurse
Ket
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 1
Subject length lower bound = 1
JIT compilation was successful
abcd
Failed: error -46: JIT stack limit reached
# End of testinput16 # End of testinput16

39
testdata/testoutput2 vendored
View File

@ -3802,15 +3802,6 @@ Capturing subpattern count = 0
Starting code units: a b Starting code units: a b
Subject length lower bound = 1 Subject length lower bound = 1
/(?R)/I
Failed: error 140 at offset 3: recursion could loop indefinitely
/(a|(?R))/I
Failed: error 140 at offset 6: recursion could loop indefinitely
/(ab|(bc|(de|(?R))))/I
Failed: error 140 at offset 15: recursion could loop indefinitely
/x(ab|(bc|(de|(?R))))/I /x(ab|(bc|(de|(?R))))/I
Capturing subpattern count = 3 Capturing subpattern count = 3
First code unit = 'x' First code unit = 'x'
@ -3842,12 +3833,6 @@ No match
xyab xyab
No match No match
/(ab|(bc|(de|(?1))))/I
Failed: error 140 at offset 15: recursion could loop indefinitely
/x(ab|(bc|(de|(?1)x)x)x)/I
Failed: error 140 at offset 16: recursion could loop indefinitely
/^([^()]|\((?1)*\))*$/I /^([^()]|\((?1)*\))*$/I
Capturing subpattern count = 1 Capturing subpattern count = 1
May match empty string May match empty string
@ -8654,18 +8639,6 @@ Failed: error 162 at offset 4: subpattern name expected
/(?P>)/ /(?P>)/
Failed: error 162 at offset 4: subpattern name expected Failed: error 162 at offset 4: subpattern name expected
/(?!\w)(?R)/
Failed: error 140 at offset 9: recursion could loop indefinitely
/(?=\w)(?R)/
Failed: error 140 at offset 9: recursion could loop indefinitely
/(?<!\w)(?R)/
Failed: error 140 at offset 10: recursion could loop indefinitely
/(?<=\w)(?R)/
Failed: error 140 at offset 10: recursion could loop indefinitely
/[[:foo:]]/ /[[:foo:]]/
Failed: error 130 at offset 3: unknown POSIX class name Failed: error 130 at offset 3: unknown POSIX class name
@ -10131,7 +10104,14 @@ No match
1: ab 1: ab
/(?P<L1>(?P<L2>0|)|(?P>L2)(?P>L1))/ /(?P<L1>(?P<L2>0|)|(?P>L2)(?P>L1))/
Failed: error 140 at offset 31: recursion could loop indefinitely abcd
0:
1:
2:
0abc
0: 0
1: 0
2: 0
/abc(*MARK:)pqr/ /abc(*MARK:)pqr/
Failed: error 166 at offset 10: (*MARK) must have an argument Failed: error 166 at offset 10: (*MARK) must have an argument
@ -11104,9 +11084,6 @@ Matched, but too many substrings
End End
------------------------------------------------------------------ ------------------------------------------------------------------
/(a+|(?R)b)/
Failed: error 140 at offset 7: recursion could loop indefinitely
/^(a(*:A)(d|e(*:B))z|aeq)/auto_callout /^(a(*:A)(d|e(*:B))z|aeq)/auto_callout
adz adz
--->adz --->adz

3
testdata/testoutput5 vendored
View File

@ -4006,9 +4006,6 @@ Subject length lower bound = 1
123abcáyzabcdef789abcሴqr 123abcáyzabcdef789abcሴqr
4: 123abc<>\x{e1}yzabc<><def>789abc<>\x{1234}qr 4: 123abc<>\x{e1}yzabc<><def>789abc<>\x{1234}qr
/[^\xff]((?1))/utf,debug
Failed: error 140 at offset 11: recursion could loop indefinitely
/[A-`]/iB,utf /[A-`]/iB,utf
------------------------------------------------------------------ ------------------------------------------------------------------
Bra Bra

158
testdata/testoutput8-16 vendored
View File

@ -2,7 +2,8 @@
# shown when the link size is 2. This is just a doublecheck test to ensure the # shown when the link size is 2. This is just a doublecheck test to ensure the
# sizes don't go horribly wrong when something is changed. The pattern contents # sizes don't go horribly wrong when something is changed. The pattern contents
# are all themselves checked in other tests. Unicode, including property # are all themselves checked in other tests. Unicode, including property
# support, is required for these tests. # support, is required for these tests. There are separate output files for
# each code unit size.
#pattern fullbincode,memory #pattern fullbincode,memory
@ -849,4 +850,159 @@ Memory allocation (code space): 14
/parens_nest_limit=1000,-fullbincode /parens_nest_limit=1000,-fullbincode
Failed: error 184 at offset 1540: (?| and/or (?J: or (?x: parentheses are too deeply nested Failed: error 184 at offset 1540: (?| and/or (?J: or (?x: parentheses are too deeply nested
/(?(1)(?1)){8,}+()/debug
------------------------------------------------------------------
0 79 Bra
2 70 Once
4 6 Cond
6 1 Cond ref
8 74 Recurse
10 6 Ket
12 6 Cond
14 1 Cond ref
16 74 Recurse
18 6 Ket
20 6 Cond
22 1 Cond ref
24 74 Recurse
26 6 Ket
28 6 Cond
30 1 Cond ref
32 74 Recurse
34 6 Ket
36 6 Cond
38 1 Cond ref
40 74 Recurse
42 6 Ket
44 6 Cond
46 1 Cond ref
48 74 Recurse
50 6 Ket
52 6 Cond
54 1 Cond ref
56 74 Recurse
58 6 Ket
60 10 SBraPos
62 6 SCond
64 1 Cond ref
66 74 Recurse
68 6 Ket
70 10 KetRpos
72 70 Ket
74 3 CBra 1
77 3 Ket
79 79 Ket
81 End
------------------------------------------------------------------
Capturing subpattern count = 1
Max back reference = 1
May match empty string
Subject length lower bound = 0
abcd
0:
1:
/(?(1)|a(?1)b){2,}+()/debug
------------------------------------------------------------------
0 43 Bra
2 34 Once
4 4 Cond
6 1 Cond ref
8 8 Alt
10 a
12 38 Recurse
14 b
16 12 Ket
18 16 SBraPos
20 4 SCond
22 1 Cond ref
24 8 Alt
26 a
28 38 Recurse
30 b
32 12 Ket
34 16 KetRpos
36 34 Ket
38 3 CBra 1
41 3 Ket
43 43 Ket
45 End
------------------------------------------------------------------
Capturing subpattern count = 1
Max back reference = 1
May match empty string
Subject length lower bound = 0
abcde
No match
/((?1)(?2)(?3)(?4)(?5)(?6)(?7)(?8)(?9)(?9)(?8)(?7)(?6)(?5)(?4)(?3)(?2)(?1)(?0)){2,}()()()()()()()()()/debug
------------------------------------------------------------------
0 133 Bra
2 41 CBra 1
5 2 Recurse
7 88 Recurse
9 93 Recurse
11 98 Recurse
13 103 Recurse
15 108 Recurse
17 113 Recurse
19 118 Recurse
21 123 Recurse
23 123 Recurse
25 118 Recurse
27 113 Recurse
29 108 Recurse
31 103 Recurse
33 98 Recurse
35 93 Recurse
37 88 Recurse
39 2 Recurse
41 0 Recurse
43 41 Ket
45 41 SCBra 1
48 2 Recurse
50 88 Recurse
52 93 Recurse
54 98 Recurse
56 103 Recurse
58 108 Recurse
60 113 Recurse
62 118 Recurse
64 123 Recurse
66 123 Recurse
68 118 Recurse
70 113 Recurse
72 108 Recurse
74 103 Recurse
76 98 Recurse
78 93 Recurse
80 88 Recurse
82 2 Recurse
84 0 Recurse
86 41 KetRmax
88 3 CBra 2
91 3 Ket
93 3 CBra 3
96 3 Ket
98 3 CBra 4
101 3 Ket
103 3 CBra 5
106 3 Ket
108 3 CBra 6
111 3 Ket
113 3 CBra 7
116 3 Ket
118 3 CBra 8
121 3 Ket
123 3 CBra 9
126 3 Ket
128 3 CBra 10
131 3 Ket
133 133 Ket
135 End
------------------------------------------------------------------
Capturing subpattern count = 10
May match empty string
Subject length lower bound = 0
# End of testinput8 # End of testinput8

158
testdata/testoutput8-32 vendored
View File

@ -2,7 +2,8 @@
# shown when the link size is 2. This is just a doublecheck test to ensure the # shown when the link size is 2. This is just a doublecheck test to ensure the
# sizes don't go horribly wrong when something is changed. The pattern contents # sizes don't go horribly wrong when something is changed. The pattern contents
# are all themselves checked in other tests. Unicode, including property # are all themselves checked in other tests. Unicode, including property
# support, is required for these tests. # support, is required for these tests. There are separate output files for
# each code unit size.
#pattern fullbincode,memory #pattern fullbincode,memory
@ -848,4 +849,159 @@ Memory allocation (code space): 28
))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) )))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))
/parens_nest_limit=1000,-fullbincode /parens_nest_limit=1000,-fullbincode
/(?(1)(?1)){8,}+()/debug
------------------------------------------------------------------
0 79 Bra
2 70 Once
4 6 Cond
6 1 Cond ref
8 74 Recurse
10 6 Ket
12 6 Cond
14 1 Cond ref
16 74 Recurse
18 6 Ket
20 6 Cond
22 1 Cond ref
24 74 Recurse
26 6 Ket
28 6 Cond
30 1 Cond ref
32 74 Recurse
34 6 Ket
36 6 Cond
38 1 Cond ref
40 74 Recurse
42 6 Ket
44 6 Cond
46 1 Cond ref
48 74 Recurse
50 6 Ket
52 6 Cond
54 1 Cond ref
56 74 Recurse
58 6 Ket
60 10 SBraPos
62 6 SCond
64 1 Cond ref
66 74 Recurse
68 6 Ket
70 10 KetRpos
72 70 Ket
74 3 CBra 1
77 3 Ket
79 79 Ket
81 End
------------------------------------------------------------------
Capturing subpattern count = 1
Max back reference = 1
May match empty string
Subject length lower bound = 0
abcd
0:
1:
/(?(1)|a(?1)b){2,}+()/debug
------------------------------------------------------------------
0 43 Bra
2 34 Once
4 4 Cond
6 1 Cond ref
8 8 Alt
10 a
12 38 Recurse
14 b
16 12 Ket
18 16 SBraPos
20 4 SCond
22 1 Cond ref
24 8 Alt
26 a
28 38 Recurse
30 b
32 12 Ket
34 16 KetRpos
36 34 Ket
38 3 CBra 1
41 3 Ket
43 43 Ket
45 End
------------------------------------------------------------------
Capturing subpattern count = 1
Max back reference = 1
May match empty string
Subject length lower bound = 0
abcde
No match
/((?1)(?2)(?3)(?4)(?5)(?6)(?7)(?8)(?9)(?9)(?8)(?7)(?6)(?5)(?4)(?3)(?2)(?1)(?0)){2,}()()()()()()()()()/debug
------------------------------------------------------------------
0 133 Bra
2 41 CBra 1
5 2 Recurse
7 88 Recurse
9 93 Recurse
11 98 Recurse
13 103 Recurse
15 108 Recurse
17 113 Recurse
19 118 Recurse
21 123 Recurse
23 123 Recurse
25 118 Recurse
27 113 Recurse
29 108 Recurse
31 103 Recurse
33 98 Recurse
35 93 Recurse
37 88 Recurse
39 2 Recurse
41 0 Recurse
43 41 Ket
45 41 SCBra 1
48 2 Recurse
50 88 Recurse
52 93 Recurse
54 98 Recurse
56 103 Recurse
58 108 Recurse
60 113 Recurse
62 118 Recurse
64 123 Recurse
66 123 Recurse
68 118 Recurse
70 113 Recurse
72 108 Recurse
74 103 Recurse
76 98 Recurse
78 93 Recurse
80 88 Recurse
82 2 Recurse
84 0 Recurse
86 41 KetRmax
88 3 CBra 2
91 3 Ket
93 3 CBra 3
96 3 Ket
98 3 CBra 4
101 3 Ket
103 3 CBra 5
106 3 Ket
108 3 CBra 6
111 3 Ket
113 3 CBra 7
116 3 Ket
118 3 CBra 8
121 3 Ket
123 3 CBra 9
126 3 Ket
128 3 CBra 10
131 3 Ket
133 133 Ket
135 End
------------------------------------------------------------------
Capturing subpattern count = 10
May match empty string
Subject length lower bound = 0
# End of testinput8 # End of testinput8

158
testdata/testoutput8-8 vendored
View File

@ -2,7 +2,8 @@
# shown when the link size is 2. This is just a doublecheck test to ensure the # shown when the link size is 2. This is just a doublecheck test to ensure the
# sizes don't go horribly wrong when something is changed. The pattern contents # sizes don't go horribly wrong when something is changed. The pattern contents
# are all themselves checked in other tests. Unicode, including property # are all themselves checked in other tests. Unicode, including property
# support, is required for these tests. # support, is required for these tests. There are separate output files for
# each code unit size.
#pattern fullbincode,memory #pattern fullbincode,memory
@ -849,4 +850,159 @@ Memory allocation (code space): 10
/parens_nest_limit=1000,-fullbincode /parens_nest_limit=1000,-fullbincode
Failed: error 184 at offset 1540: (?| and/or (?J: or (?x: parentheses are too deeply nested Failed: error 184 at offset 1540: (?| and/or (?J: or (?x: parentheses are too deeply nested
/(?(1)(?1)){8,}+()/debug
------------------------------------------------------------------
0 119 Bra
3 105 Once
6 9 Cond
9 1 Cond ref
12 111 Recurse
15 9 Ket
18 9 Cond
21 1 Cond ref
24 111 Recurse
27 9 Ket
30 9 Cond
33 1 Cond ref
36 111 Recurse
39 9 Ket
42 9 Cond
45 1 Cond ref
48 111 Recurse
51 9 Ket
54 9 Cond
57 1 Cond ref
60 111 Recurse
63 9 Ket
66 9 Cond
69 1 Cond ref
72 111 Recurse
75 9 Ket
78 9 Cond
81 1 Cond ref
84 111 Recurse
87 9 Ket
90 15 SBraPos
93 9 SCond
96 1 Cond ref
99 111 Recurse
102 9 Ket
105 15 KetRpos
108 105 Ket
111 5 CBra 1
116 5 Ket
119 119 Ket
122 End
------------------------------------------------------------------
Capturing subpattern count = 1
Max back reference = 1
May match empty string
Subject length lower bound = 0
abcd
0:
1:
/(?(1)|a(?1)b){2,}+()/debug
------------------------------------------------------------------
0 61 Bra
3 47 Once
6 6 Cond
9 1 Cond ref
12 10 Alt
15 a
17 53 Recurse
20 b
22 16 Ket
25 22 SBraPos
28 6 SCond
31 1 Cond ref
34 10 Alt
37 a
39 53 Recurse
42 b
44 16 Ket
47 22 KetRpos
50 47 Ket
53 5 CBra 1
58 5 Ket
61 61 Ket
64 End
------------------------------------------------------------------
Capturing subpattern count = 1
Max back reference = 1
May match empty string
Subject length lower bound = 0
abcde
No match
/((?1)(?2)(?3)(?4)(?5)(?6)(?7)(?8)(?9)(?9)(?8)(?7)(?6)(?5)(?4)(?3)(?2)(?1)(?0)){2,}()()()()()()()()()/debug
------------------------------------------------------------------
0 205 Bra
3 62 CBra 1
8 3 Recurse
11 133 Recurse
14 141 Recurse
17 149 Recurse
20 157 Recurse
23 165 Recurse
26 173 Recurse
29 181 Recurse
32 189 Recurse
35 189 Recurse
38 181 Recurse
41 173 Recurse
44 165 Recurse
47 157 Recurse
50 149 Recurse
53 141 Recurse
56 133 Recurse
59 3 Recurse
62 0 Recurse
65 62 Ket
68 62 SCBra 1
73 3 Recurse
76 133 Recurse
79 141 Recurse
82 149 Recurse
85 157 Recurse
88 165 Recurse
91 173 Recurse
94 181 Recurse
97 189 Recurse
100 189 Recurse
103 181 Recurse
106 173 Recurse
109 165 Recurse
112 157 Recurse
115 149 Recurse
118 141 Recurse
121 133 Recurse
124 3 Recurse
127 0 Recurse
130 62 KetRmax
133 5 CBra 2
138 5 Ket
141 5 CBra 3
146 5 Ket
149 5 CBra 4
154 5 Ket
157 5 CBra 5
162 5 Ket
165 5 CBra 6
170 5 Ket
173 5 CBra 7
178 5 Ket
181 5 CBra 8
186 5 Ket
189 5 CBra 9
194 5 Ket
197 5 CBra 10
202 5 Ket
205 205 Ket
208 End
------------------------------------------------------------------
Capturing subpattern count = 10
May match empty string
Subject length lower bound = 0
# End of testinput8 # End of testinput8